Wednesday, September 26, 2012

The following scenario will describe how to proceed when you lose a non-system tablespace, I mean
not the SYSTEM and UNDO tablespace. In particular this example will restore the lost tablespace to its original location.
When you lose a non-system tablespace you cannot access and query only objects that were created on their datafiles;
meanwhile
users can continue to query and use all the others objects in the database and you can restore it while the database is open.
Moreover because your database is running in ARCHIVELOG mode any committed transactions don't need to be inserted again.
Let's simulate a loss of the EXAMPLE tablespace, in my case formed by only one datafile:

As you can see the objects located on EXAMPLE tablespace are no more available.
So it's time to recover our tablespace: I'd like to remind you that
all the following steps are executed while the database is OPEN as you can see even from the screen log of
rman console (connected to target database: ORCL (DBID=1229390655)):

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